In the Israel Defense Forces most of the M16A1 rifles were replaced by the M4A1 carbine as the standard issued rifle in the early 2000s, although they remained in service with reserve soldiers and less combatant troops.

Phase II ( also known as " White Phase ") is where soldiers begin actually firing weapons, starting with the rifle or carbine ( M4A1 ).

The " E-grip basic " model comes with an E-grip ( electronic firing ), while the " Tactical " model ( which resembles an M4A1 carbine ) includes a collapsible CAR stock and a shroud.

# REDIRECT M4 carbine # M4A1

The player is in cs_italy map using the Maverick M4 carbine # M4A1 | M4A1 Carbine weapon.

* CQBR type 1: Made from M4A1 uppers by shortening the barrels and opening gas ports, no longer produced, STD carbine buffer in use in host lowers at time of fielding.

There is an American Sherman M4A1 tank and a British Achilles SP17 displayed as monuments to the town's liberation.

The M4A1 is used by almost all U. S special operation units including, but not limited to, the Army Rangers, Army Special Forces, Navy SEALs and Air Force Combat Control Teams.

The M4A1 is especially favored by counter-terrorist and special forces units for close quarters combat because of the carbine's compactness and firepower.

These weapons, known by Colt as the Model 921HB ( for Heavy Barrel ), have also been designated M4A1, and as far as the government is concerned the M4A1 represents both the 921 and 921HB.

The Mk 18 Close Quarters Battle Receiver is an M4A1 with a 10. 3-inch barrel upper receiver.

He is armed with a M4A1.

The Close Quarter Battle Receiver ( CQBR ) is a replacement upper receiver for the M4A1 Carbine.

* Upper and lower receivers: The lower receiver is a standard M4A1 lower receiver sometimes modified with the addition of a CQD RSM sling adapter plate.

** The M4A1 is used as a marksman rifle, equipped with Harris bipod and Trijicon ACOG telescopic sights.

This Training Weapon model is a replica of the M4A1 and also has a G & G Trijicon Advanced Combat Optical Gunsight | ACOG scope replica.

The M4 has selective fire options including semi-automatic and three-round burst ( like the M16A2 and M16A4 ), while the M4A1 has the capability to fire fully automatic instead of three-round burst ( like the M16A1 and M16A3 ).

The M4A1 has a " S-1-F " ( safe / semi-automatic / fully automatic ) trigger group, while the M4 has a " S-1-3 " ( safe / semi-automatic / 3-round burst ) trigger group.

All U. S. Army forces will begin replacing their basic M4 carbines and all 600, 000 M16 rifles with the M4A1 variant in 2014.

The U. S. Army has largely relegated the M16A2 to non-combat roles, choosing instead the M4 and M4A1.

* Operator's Manual for Rifle, 5. 56 mm, M16A2 ; Rifle 5. 56 mm, M16A3 ; Rifle, 5. 56 mm, M16A4 ; Carbine, 5. 56 mm, M4 ; Carbine, 5. 56 mm, M4A1

The rifles in use by the team are the Colt M16A2, Colt CAR-15A2 Model 777, M4 / M4A1 5. 56mm carbines, M14 7. 62mm, and H & K HK33E 5. 56mm assault rifles.

It should also be pointed out that, according to a PDF detailing the M4 Carbine improvement plans released by PEO Soldier, the direct impingement system will only be replaced after reviews are done comparing the direct impingement system to commercial gas piston operating system to find out and use the best available operating system in the US Army's improved M4A1.

The Army announced also to have open competition for the newly designed M4 bolt carrier and gas piston operation system, which will be fitted to the newly bought M4A1 carbines.

On 21 April 2012, the US Army announced to begin purchasing over 120, 000 M4A1 carbines to start reequipping front line units from the original M4 to the new M4A1 version.

Some features of the M4 and M4A1 compared to a full-length M16-series rifle include:

Like all the variants of the M16, the M4 and the M4A1 can be fitted with many accessories, such as night vision devices, suppressors, laser pointers, telescopic sights, bipods, either the M203 or M320 grenade launchers, the M26 MASS shotgun, forward hand grips, and anything else compatible with a MIL-STD-1913 Picatinny rail.

Except for the very first delivery order, all U. S. military-issue M4 and M4A1 carbines possess a flat-top NATO M1913-specification ( Picatinny ) rail on top of the receiver for attachment of optical sights and other aiming devices — Trijicon TA01 and TA31 Advanced Combat Optical Gunsights ( ACOG ), EOTech 550 series holographic sights, and Aimpoint M68 Close Combat Optic ( M68 CCO ) being the favorite choices — and a detachable rail-mounted carrying handle.

Standards are the Colt Model 920 ( M4 ) and 921 ( M4A1 ).

* Recommended Cartridges: M193 Ball ( M16A1 Rifle or XM177 Carbine ) or M855 Ball ( M16A2 / M16A3 Rifle, M16A4 Rifle, or M4 / M4A1 Carbine ).

Also, APS ( Accuracy Pneumatics Shooting ) makes EBB M4A1, M4 Commando, and the AK47.

To complicate matters, a very small number of Canadian licence-built Sherman IIs ( M4A1 ), the Grizzly, were converted to Fireflies in Canada and used for training, but none saw action.

All of these feature a flashlight and some have modifications to give SWAT a tactical advantage in certain situations ; for example, the M4A1 can fire ' beanbag ' less than lethal rounds which hurt but do not kill targets, and the M1 Super 90 has secondary breaching ammunition for shooting locks out of doors.

Muzzle velocity, range and penetration in the tables below are for maximum charge in form of complete M4A1 propelling charge.

* Colt M4A1 assault rifle ( with RIS )-withdrawn from use, replaced by Heckler & Koch HK416

STAR officers use weapons that include the Heckler & Koch G36C, M4A1 and SAR 21 assault rifles, the Heckler & Koch MP5 submachine gun, various shotguns such as the Remington 870, and Sphinx 3000 pistols ( these replaced the previously used Glock 17 and 19 ) as standard sidearms.

Since 2006, both the M16 and the M4A1 are being replaced by the Israeli designed and manufactured Tavor TAR-21 bullpup assault rifle.

As of 2012, the Tavor has replaced the M16A1 and M4A1 in four regular infantry brigades.

* Colt M4A1 5. 56 mm NATO Carbine

An M4A1 just after firing, with an ejected Cartridge ( firearms ) | case in mid-air ; the M203 grenade launcher | M203 and Aimpoint CompM2 | M68 CCO are attached.

The kit features an M4A1, a Rail Interface System ( RIS ) handguard developed by Knight's Armament Company, a shortened quick-detachable M203 grenade launcher and leaf sight, a KAC sound suppressor, a KAC back-up rear sight, an Insight Technologies AN / PEQ-2A visible laser / infrared designator, along with Trijicon's ACOG and Reflex sights, and a night vision sight.